CI. 8.] CONVOLVULI. 103 



which Heliotropium, Echium,Lithospermuni,fig. 178, 

 Pulmonaria, Onosma, and perhaps Coldenia, all which 

 have a naked-mouthed, or pervious, Corolla ; with 

 Symphytum, Lycopsis, Myosotis, Anckusa, Borago, 

 Asperugo, Cynoglossum, and Trichodesma of Brown, 

 whose tube is closed with valves, constitute indubi- 

 table examples. Tournefortid, Ehretia, and Coirlia, 

 (the latter comprehending Varronia,) are also retained 

 here; but Mr. Brown proposes to separate Hydro- 

 phyllum, Ellisia, and Jussieu's Phacdia, as having a 

 copious cartilaginous Albumen, compound, or at 

 least deeply lobed, Leaves, and a capsular Fruit. 



The true Boraginecc are allied by their Seeds to 

 Labiate? , Orel. 39; but differ in their pungent or 

 warty, not hairy, pubescence ; mucilaginous, not aro- 

 matic, qualities ; alternate, not opposite, Leaves ; 

 and blue, rather than crimson or purple, Flowers, ex- 

 cept in the bud. Messerschmidia and Cerinthe differ 

 from the rest in having a kind of two-celled twin 

 Capsule, or Nut; and Cerinthe has a glaucous, 

 smoother, though warty, habit, with reddish or yellow 

 Flowers. Onosma too is always yellow-flowered. The 

 change in the Corolla of the Boraginea: in general, 

 from bright red, to a vivid blue, as the Flower ex- 

 pands, apparently caused by the sudden loss of some 

 acid principle, is a very curious phenomenon. 



Ord. 43. Convolvuli. "Calyx deeply 5-cleft, 

 often permanent. Corolla regular, with a generally 

 5-lobed limb. Stamens as many as the segments, al- 



